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/* $OpenBSD: network.c,v 1.17 2014/07/22 07:30:24 jsg Exp $ */
/* $NetBSD: network.c,v 1.5 1996/02/28 21:04:06 thorpej Exp $ */
/*
* Copyright (c) 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
#include "telnet_locl.h"
#include <sys/socket.h>
#include <errno.h>
#include <poll.h>
#include <unistd.h>
Ring netoring, netiring;
unsigned char netobuf[2*BUFSIZ], netibuf[BUFSIZ];
/*
* Initialize internal network data structures.
*/
void
init_network(void)
{
ring_init(&netoring, netobuf, sizeof netobuf);
ring_init(&netiring, netibuf, sizeof netibuf);
SetNetTrace(NULL);
}
/*
* Check to see if any out-of-band data exists on a socket (for
* Telnet "synch" processing).
*/
int
stilloob(void)
{
struct pollfd pfd[1];
int value;
do {
pfd[0].fd = net;
pfd[0].events = POLLRDBAND;
value = poll(pfd, 1, 0);
} while ((value == -1) && (errno == EINTR));
if (value < 0) {
perror("poll");
quit();
}
if (pfd[0].revents & POLLRDBAND)
return 1;
else
return 0;
}
/*
* setneturg()
*
* Sets "neturg" to the current location.
*/
void
setneturg(void)
{
ring_mark(&netoring);
}
/*
* netflush
* Send as much data as possible to the network,
* handling requests for urgent data.
*
* The return value indicates whether we did any
* useful work.
*/
int
netflush(void)
{
int n, n1;
if ((n1 = n = ring_full_consecutive(&netoring)) > 0) {
if (!ring_at_mark(&netoring)) {
n = send(net, (char *)netoring.consume, n, 0); /* normal write */
} else {
/*
* In 4.2 (and 4.3) systems, there is some question about
* what byte in a sendOOB operation is the "OOB" data.
* To make ourselves compatible, we only send ONE byte
* out of band, the one WE THINK should be OOB (though
* we really have more the TCP philosophy of urgent data
* rather than the Unix philosophy of OOB data).
*/
n = send(net, (char *)netoring.consume, 1, MSG_OOB);/* URGENT data */
}
}
if (n < 0) {
if (errno != ENOBUFS && errno != EWOULDBLOCK) {
setcommandmode();
perror(hostname);
(void)close(net);
ring_clear_mark(&netoring);
longjmp(peerdied, -1);
}
n = 0;
}
if (netdata && n) {
Dump('>', netoring.consume, n);
}
if (n) {
ring_consumed(&netoring, n);
/*
* If we sent all, and more to send, then recurse to pick
* up the other half.
*/
if ((n1 == n) && ring_full_consecutive(&netoring)) {
(void) netflush();
}
return 1;
} else {
return 0;
}
}
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